A current will flow through an electrical component (or device) only if there is a
or potential difference (p.d.), across its ends. The bigger the potential difference across a component, the
the that flows through it.
Components resist a current flowing through them. The bigger their , the smaller the
produced by a particular
voltage.

The p.d. across a component in a circuit is measured in
(V) using a connected across the component.

The current flowing through a component in a circuit is measured in
(A) using an
connected in with the component.

Resistors in series:

Match each combination of
resistors with it's equivalent series resistor:

a

8W
2W

12W

b

5W
6W

11W

c

2W
3W
4W

10W

d

8W
2W 2W

9W

Look
at this series circuit.

If the ammeter on the right
reads 3A - how would the ammeter on the left compare? .

This is because:

The Voltmeter labeled A reads
6V.

If the two resistors are
equal what must voltmeter B read? This is because: